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The two manifolds are named "Bank 1" and "Bank 2", with "Bank 1" describing the manifold that is closer to the passenger compartment, and "Bank 2" describing the manifold that is closest to the front of the car. "Sensor 1" is located between the manifold and the catalytic converter, while "Sensor 2" is located between the catalytic converter and the joint of the y-pipe.
Bank 2 o2 sensor 1 is on the back side of the engine. Simply follow the exhaust manifold nearest the firewall the first o2 is bank 2 o2 1 the next o2 will be bank 2 o2 2. The o2 you see by the radiator is bank 1 o2 1.
the O2 bank 1 sensor 2 its located on the passenger side after the catalyst converter, you will see two sensors in this side of the exhaust its the second sensor
Bank 1 02 is on the exhaust side that cylinder 1 is on bank 2 would be the other there should be bank 1 sensor one and bank 1 sensor 2 and on the other side it is bank 2 sensor 1 and sensor 2 with that in mind get a firing order from a auto part store bank 2 should be on the driver side sensor 1 is before the cat sensor 2 after the catalytic convertor
Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
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